题解 | #求1+2+3+...+n#变长数组 构造函数
求1+2+3+...+n
http://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1
#include<stdlib.h>
class add{
public:
add(){
i+=j;
j++;
}
static int i,j;
};
int add:: i=0;
int add:: j=1;
class Solution {
public:
int Sum_Solution(int n) {
add sum[n];
return add:: i;
}
};